package java虚拟机;

/**
 * @author juntao zhang
 */
public class 自动装箱的陷阱 {

  public static void main(String[] args) {
    Integer a = 1;
    Integer b = 2;
    Integer c = 3;
    Integer d = 3;
    Integer e = 321;
    Integer f = 321;
    Long g = 3L;
    System.out.println(c == d);//true
    System.out.println(e == f);//false
    System.out.println(e.equals(f));//true

    System.out.println(c == (a + b));//true
    System.out.println(c.equals(a + b));//true

    System.out.println(g == (a + b));//true
    System.out.println(g.equals(a + b));//false
  }
}
